Alkyl-Substituted N-Vinylimidazolium Polymerized Ionic Liquids: Thermal Properties and Ionic Conductivities
Alkyl-Substituted N-Vinylimidazolium Polymerized Ionic Liquids: Thermal Properties and Ionic Conductivities
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DOI：
10.1002/macp.201100389
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发表时间：
2011-12-01
影响因子：
2.5
通讯作者：
Long, Timothy E.
中科院分区：
文献类型：
--
作者：
Green, Matthew D.;Salas-de la Cruz, David;Long, Timothy E.
聚合离子液体（PILs）的结构-性能关系将化学结构与离子电导率联系起来，揭示了一系列烷基取代乙烯基咪唑PILs的玻璃化转变温度（Tg）和离子跳跃机制相关能量对离子电导率的重要性。不同长度的烷基取代乙烯基咪唑基聚合物为前驱体提供了不同的可交换阴离子，进一步提高了热稳定性和离子电导率。无论烷基取代基长度如何，随着阴离子尺寸的增大，Tg减小，失重起始时间TD增大。随着烷基取代基长度的增加，含有Br-和BF4-反阴离子的聚合物的Tg降低。离子电导率在TfO- < Tf2N-的反阴离子交换后增加了一个数量级。
Structure-property relationships for polymerized ionic liquids (PILs) relate chemical structure to ionic conductivity and reveal the importance of glass transition temperature (Tg) and the energy associated with an ion-hopping mechanism for ion conduction for a series of alkyl-substituted vinylimidazolium PILs. The alkyl-substituted vinylimidazolium-based PILs with varying lengths of n-alkyl substituents provide diverse precursors with exchangeable anions to further enhance thermal stability and ionic conductivity. As the anion size increases, regardless of alkyl substituent length, Tg decreases and the onset of weight loss, TD, increases. As the length of the alkyl substituent increases, Tg decreases for PILs with Br- and BF4- counteranions. Ionic conductivity increases over an order of magnitude upon exchange of the counteranion from TfO- < Tf2N-.